Typewriting machine



Dec. 7, 1926.

A. G. KUPETZ TYPEWRITING MACHINE Filed Fb. 12. 1924 Patented Dec. 7, 1926.

ADOLPH G. KUPETZ, OF NEW RQGHELLE, NEW YORK. ASSIGNOB T O'U'NDERVVOOD TYPE- WRITER COMPQNY, OF NEW YORK, N. Y., 'A CORPORATION OF DELAWARE.

TYPEWBITING MACHINE.

Application 'filed February 'means designed to assure proper actua tion of the platen when the line-spacing mechanism is actuated rapidly.

In the Underwood Standard typewriting machine, line-spacing of the platen is effected by means of a line-space pawl engaging aratchet-wheel connected with the platen, and

1c the extent of the line-spacing movement is determined by means of a shelf supporting the rearward endot theline-spacing pawl and movable forwardly and rearwardly by a. setting lever to determine the initial engagement of the pawl with the ratchetwheel. When single spacing is to be efiected, the pawl is held in the highest of. its threepositions, and in its rearward movement strikes a ratchet-tooth near the top of the wheel,

$1 so that, especially in case the setting lever is positioned for a single-space operation of the platen, the pawl is especially liable to ride over the teeth of the ratchet-wheel when actuated rapidly. It has also been found that 535 too rapid actuation of the platen may cause slippage between the platen and a work-sheet thereon, and consequently defective linespacing of the work-sheet, even when the platen is line-spaced properly. It has been proposed to provide yielding means between the manual line-space handle and the pawl to prevent improper action of this kind. In certain machines, for example, the Underwood bookkeeping machine, it has been prof' i posed to return the carriage by means of a motor, such action being effected, in certain forms of the machine, by a motor-driven pinion engaging a carriage-return rack on the carriage, and such carriage-return rack 41: has been slidably connected with the carriage so that the line-space mechanism may be actuated thereby, prior to the carriage-return action, to actuate the pawl-carrying slide. In case of such motor-actuated return of the carriage, yieldable devices interposed between the manual line-space lever and the line-space pawl will be ineiiective to prevent improper line-spacing by the motor-return .mechanism.

v FAn object. of the present inventionisto provide means to assure proper line-spacing of thefplatendu-ring the return movement of the carriage, as, for example, when the car'- riage is returned by motor carriage-return means.

a, 1924.. Serial No. 692,283.

In the embodiment of the inventionherein disclosed, means are provided whereby linespa'clng of the platen may be effected in the usual Underwood manner by a manual manipulation ofthe line-space lever, or the linespacing mechanism may be operated by a power-driven carriage-return mechanism at will, each form operating independently of the other.

Toavoi'd-too rapid actuation of the linespace'pawl, provision is made of resilient means to cushion the action of the line-space rack on the line-space pawl, and, in the preferred form of the invention, such cushioning means is mounted on the end of the carriage-return rack, so that, uponmovement of the carriage-return rack-by its motor, the cushioning devicewill yield sufliciently .to assure proper engagement of the line-space pawl with the ratchet-wheel and also to assure avoidance of slippage between the platen and a work-sheet thereon. The resistance of the cushioning means is insufficient to cause a line-spacing movement of the platen, and hence after the pawl is brought into engagement with the tooth of the ratchet during the initial return movement of the rack, the pawl is given sufficient time to become fully engaged with the ratchet-tooth, during the interval the cushioning element is being oom pressed to a fined stop position by the continuous movement of the rack, when the pawl is picked up-to complete the linespacing-- movement. The pawl has a stop motion durmg the hne-spacmg movement and the interval of this stop mot on 1s determmed by.

the time required to compress the cushioning means.

Other features and advantages will hereinafter appear. I v, 1 In the accompanying drawings, Figure 1 is a fragmentary perspective view, showing one form of the invention applied to so much of an Underwood standard.

typewriting machine as is-necessary for the purpose of illustration;

Figure 2 is a diagrammatic side elevation ofthei machine with theinvention applied thereto.

' tion, showing the cushioning device mount- Figure 3 is adet'ail :view, partly in A platen '10 is'supported by an axle 11- I journaled in the ends 12 of a platen-frame 13, and the platenmay-be' line-spac'ed'by bar25, the position of a fat resisted nd a e .bleek ll-member as means of a ratchet-Wheel 1 1 fixed on the axle 11. Upon actuation of a linespace slide 15 against the action of a spring 16, a pawl 17, pivoted at 18, will be moved rearwardly to cause tooth l9 thereon to engage one of the teeth ofthe ratchet 14 to turn the same,

the ratchet-Wheel l i being held against acci dental movement by means of a roll 205 pivoted on the rear end of an arm 21 swingabout a pivot 22 and nrgedtow rd the set- Wheel by means or a spring determine the extent of ctuation of 'IQt WllQ-Bl is, the forward end of the l 1 is normally supported by a shelf or 4 24 on a bar25, slidahly mounted on the pivot 22 and yieldahly held in anyone of three positions by means of a spring-detcnt co operating with depressions 2? in the the bar 25 being deterinined by a line-space-setting handle 28 and s rvingi'to, determine single-space, peceand triple Space actuation by the tee... 7 space meehanism'isset for single-space actuation. I v i i The platen-frame 13 is mounted in a carslidahle transversely of the machine on a rear rail 30 mounted-on the machineriage 29 'fran el 'l he carriage is urged in a letterteeding' direction 'by a spring-drum, not slit-rin and is norn'ially held against such movement by a racli' 81 on arms 32 pivoted on the carriage, the rack 31 heing'nornially in mesh With a pinion 33 forming part of the usual escapeinent mechanism,

not retnrningthe carriage, provision may be made, in addition to the usual lines pace and carriage-return lever (not shown), of motor-actuated carriage-return mechanism, one form'ot which is disclosed in the patent tol A. Hart, No. LQS'SQOS, dated Septemlxerdol9l7; As herein disclosedythe motor (not shown), when set into operation, 'i'otates a clutch-shaft 34: on which is fixed a clutch-member 35; and at the same time an arm 36, projecting into a groove 37 in a clii'tcli-rneinb'ei' 3.8 loosely mounted on the shaft 3%, is shifted to move the member 38 rearwardly into effective engagement'with the clutch-member Mounted on the clutch-member 38 is a broad pinion 39 mesh mg with a rack d9 connected Witlithe car- 7 ria 2 9 sothat actuation of the ainion 39 acts to return the carriage to position for beginning nether Writingline, l

The rack 40 is slidahlyanounted on the carriage; the mounting at one end'heing shown in Figu-re '1; As shown said ure, a bracket 41 depends from a crossine her orha-i' efthetarriagaand se ured tli tofa"hloitdzoi ne n ibe eswn'aig on: is i'fiastene'd by suitable means,

" 45":fitti r siiohae a' screw ist-gas m a l." leis-shown" in Figurefi, the l.ine-

7 claim: a V c p i I 1. In a typewr ting machine, in coinhiw neoaevs is provided with an enlarged end 47, in which is journaled a vertical shaft l8 held against downward movement through portion a7 by means of a collar 49, Secured on the shaft 48 at the lower sideof the portion 457, is a rearWardly-en'tending armed to be actuated by said rack, the connection being such tha the arm 50 may be actuated inde-' penden y of the rack 40, but actuation of I which projects a vertical pin 53 fixed in a rearward extension of the line-space slide 15. it will he seen that, u 'aon actuation of the carriage-retur n raclg lO, theline space slide 15 is drawn rearWardl-y and the'pl'aten i0 is line-spaced at the" loe nni ng' of the carriage-return movement: i J

Lin"commotion With the mote otuated'return of the cariage,'-the nioveinentof the latter is quite rapid," anth as the slide 15 moves rearW-ardly' the tooth 19, even it it strikes tooth of the ratchetheel 14, tends to rideover the same, and make. the linespacing action uncertain' Such failure is especially liable to occur When the line-spaceis an arm 5 l having at its upwardly at tlie rear of the rack a0 and se 7 cured thereto by suitable means, such screws Obviously themein he made into ml with the racli. I sired. Prci'erahly' the arm 50 is operated by a plunger tit-ting into an openingdll in tl' e'portion Wand having reduced stem 60 passing through the portion 5'? t0 the outer, end tl'lere'oi, the plunger 6 0' being urged to the left, seen in Figure 3; by a spring 62 and being limited in its movement to the leiit'hysuitable means, such nut 63 and a'loclbnut 6%; It will be evident that, hy'n eans' oi the nuts 63 and fitthe normal p'ositi-n" of the plunger 60 relative to the nae-1:40 may he varied'to obtain the pie r eels between the plung 50th; assureunifor n line-t the platen.

Variatinns rnay 'be resorted to Within the scope "of the ii yention, and .portions of the movements ma :be use' d withouttl *ifiawingthns deser-ibed my i1 411 ,n, l

nation, a platen, a carriage therefor, a device for line-spacing a work-sheet on the platen, and carriage-return means including a rack having a lost-motion connection with the carriage and means actuable by said rack in its lost-motion movement to actuate said line-space device, said line-space device including cushioning means for easing the line space action to assure proper linespacing of the work-sheet.

2. In a typewriting machine, in combination, a revolubl-e platen, a carriage therefor, a carriage-return rack having a lost-motion connection with the carriage, and line-space mechanism for the platen including a swingable arm adjacent said rack, a projection extending from said rack across the path of said arm, and a spring-pressed plunger mounted on said projection to engage said arm and to cushion the actuation of the linespace mechanism to assure proper-line-spacing of the platen.

3. In a typewriting machine, in combination, a revoluble platen, a carriage therefor, a carriage-return rack having a lost-motion 7 connection with the carriage, and line-space mechanism for the platen including a swingable arm adjacent said rack, a project-ion extendingfrom said rack across the path of said arm, and a spring-pressed adjustable plunger mounted on said projection to engage said arm to delay the actuation of the line-space mechanism and to assure positive line-spacing of the platen.

4. In a typewriting machine, in combination. a revoluble platen, a carriage therefor, a line-space wheel connected with said platen, a pawl to actuate said wheel, a carrier on which said pawl is pivoted, a carriage-return rack slidable on said carriage to permit a limited free movement of said rack before the same becomes effective on the carriage, and a spring-pressed plunger between said carriage-return rack and the pawl-carrier to elfect line-spacing of the platen due to the movement of the rack relative to the carriage.

5. In a typewriting machine, in combination, a platen, a carriage therefor, a ratchetwheel connected with the platen, a pawl to actuate said ratchet-wheel, a pawl-actuating member, a carriage-return mechanism in cluding a power driven. rack mounted on said carriage for a free initial movement before effecting the carriage-return, and intermediate connection between the carriage-return rack and the pawl-actuating member including a cushion device to effect a premature actuation of said pawl to a ratchet-tooth posiate connections between the carriage-return racl: and the pawl-actuating member ineluding a cushion device to effect a cushioned actuation of said pawl to prevent the pawl from riding over the teeth of said ratchetwheel, and adjusting means to vary the efiect of said cushiondevice. V

7. In a typewriting machine, in combination, a revoluble platen, a carriage therefor, a device to line-space the platen, a carriagereturn mechanism including a power-driven rack having a lost-motion connection with the carriage, and a spring device, tensioned by the carriage-return rack during its idle movementwith respect to the carriage, to actuate the line-space device and by its cushioning el'fect assure correct lin'e feeding of a work-sheet on the platen.

8. In a typewriting machine, in combination, a platen, a carriage therefor, carriage.

return means including a her having lost motion on the carriage and provided with a spring-supported abutment, and means for line-spacing the platen comprising an arm against which said abutment is pressed during the lost-motion movement of the bar, the spring-supported abutment serving to actuate the line-spacing means more slowly than would be the case if the line-spacing means were acted upon directly by said bar.

- ADOLPH G. KUPETZ. 

